ClusterConfiguration extension for setting Startup class

[jasonholloway]

Just what you'd expect from the title, I'd suppose.

I was moaning a little bit on #1765 about configuring the startup class being non-obvious, especially in the context of TestCluster, which prepopulates overrides.

So - a small helper extension method to set the StartupTypeName property on all nodes.

[jdom]

I'd rename it to UseStartupType, to be consistent with the actual configuration setting.

[jdom]

Great, thanks for this, it will also make it easier to do #1765 without breaking many users if they are using programmatic config.

[jasonholloway]

Just out of interest, @jdom, would I have been better to rebase and force push here?

[jdom]

Since the changeset is simple, a squash and rebase is typically better if you know how to do it. But it is still fine, since now GitHub has a way to accept the PR by doing a squash and rebase instead of a normal merge.
For huge PRs though, you don't want to squash and rebase constantly while people are reviewing because it's hard to see what changed from version to version, and we only ask people to rebase once it's ready to be merged.

[jdom]

Thanks @jasonholloway !